In this recipe, we will learn how to specify additional permissions to be used by our application.
Following on from our previous recipe, we will learn how to implement additional permissions.
To begin, follow the simple steps as outlined in the given order:
- Open the
AppDelegate.mimplementation file from the Project Navigator. - Next, modify the
didFinishLaunchingWithOptions:method as shown in the following code snippet:- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions { self.window = [[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]] autorelease]; // Override point for customization after // application launch. self.viewController = [[[ViewController alloc] initWithNibName:@"ViewController" bundle:nil] autorelease]; self.window.rootViewController = self.viewController; // Do any additional setup after loading the view, // typically from a nib. self.facebook = [[Facebook alloc] initWithAppId:@"YOUR_APPID_HERE" andDelegate:self]; // Check and retrieve authorization information NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults]; if ([defaults objectForKey:@"FBAccessTokenKey"] && [defaults objectForKey:@"FBExpirationDateKey"]) { self.facebook.accessToken = [defaults objectForKey:@"FBAccessTokenKey"]; self.facebook.expirationDate = [defaults objectForKey:@"FBExpirationDateKey"]; } // Set up the permissions to use for this App NSArray *permissions = [[NSArray alloc] initWithObjects: @"user_likes", @"user_birthday", @"user_interests", @"read_stream",nil]; // Check to ensure that we have a valid session object if (![self.facebook isSessionValid]) { [self.facebook authorize:permissions]; } [permissions release]; [self.window makeKeyAndVisible]; return YES; }
In this recipe, we begin by declaring an NSArray object variable permission that will be used to store each of our permissions that we want to request. We then pass this variable to our authorize method of the facebook object, before finally releasing the memory allocated by the object.
Note
For more information on the full list of available permissions that are made available to you, refer to the Facebook Permissions reference at the following URL: https://developers.facebook.com/docs/authentication/permissions/
When using Facebook integration within your application, you can specify additional permissions to be used by your application. When you launch the application without specifying additional permissions, this will use the default permissions and will only get the ability to read only the user's basic information and this includes certain properties of the User object such as id, name, picture, gender, and their locale. If you want to read additional data or publish data back to Facebook, you will need to request these additional permissions.
These additional permissions fall into the following sections, as shown in the given table:
|
Requested permissions |
Description |
|---|---|
|
Basic information (no permissions) |
When a user authorizes your application and you don't specify additional permissions, your application will only have access to the user's basic information. This includes certain properties such as their id, name, gender, locale, and their profile picture. |
|
User and friend permissions |
As a part of the authorization process, you can also request for additional access to your user's profile. You can access information such as their birthday, activities, checkins, and education history. The user must, however, authorize this at startup, in order to continue and authorize your application. |
|
If you are using the Enhanced Authorization Dialog, the extended permissions will be presented to the user. These types of permissions allow you to read your user's friend lists, read the user's mail inbox, access your user's friend requests, and create and modify events on the user's behalf. | |
|
Open graph permissions |
These types of permissions allow your applications to publish actions to the Open Graph API and enable it to retrieve any actions that have been published by any other application. |
|
Page permissions |
These types of permissions allow you to retrieve |